Bulletin Zoologisch Museum

■ I NIVERSITEIT VAN AMSTERDAM

Vol. 10 No. 12 1985

On some slugs from the isle of , , including the

descriptions of two new species (: )

A.J. de Winter & L.J.M. Butot

Abstract

Deroceras and D korthionensis are described from the Isle of johannae n.sp. . n.sp. Andros,

data of Greece. Distributional Limax aff. conemenosi Boettger, Tandonia sowerbyi Férussac, as

well of milacid Attention is drawn in the as an unidentified are provided. to a peculiarity

genital anatomy of L. aff. conemenosi , in comparison with specimens attributed to this species

from outside Greece. The material has been deposited in ZMA.

INTRODUCTION 1823) (cf. Simroth, 1889 as Amalia carinata

(Risso, 1826)). In this paper we will add three

more species: two Deroceras species, new to

Andros is the northernmost island of the Cycla- science, and a Milax or Tandonia, of which on-

des visited in 1984 but which differs Archipelago. It was April ly juveniles were available,

the his wife. This from in external fea- by second author and paper conspiciously T. sowerbyi

deals with the collected this only slugs during tures .

landsnails will dealt indebted Prof. trip. The remaining be We are to A. Wiktor, Wroclaw,

with elsewhere (Butot, in prep.). Poland, for his kindness in discussing the iden-

far few authors have attention of So paid to tity our specimens.

the slug fauna of this island. Simroth' s (1889) Live specimens were drowned in water before

the first and extensive in alcohol 70%. All paper was most one, being preserved measure-

other authors only quoted his results (Von Mar- ments have been taken from preserved material.

tens, 1889; Wagner, 1940). Mylonas (1982) gave Abbreviations used.- A, atrium; AM, atrial

a summary of the malacofauna of Andros and also muscles; APP, penial appendage; L, liver; OD,

added some new records of slugs. Untill now the free oviduct; OT, ovotestis; P, prostate; PC,

have been retractor following slugs reported: Limax cone- penial caecum; PE, penis; PR, penial menosi O. Boettger, 1882; Deroceras berytensis muscle; R, rectum; RMNH, Rijksmuseum van Natuur-

var. andrios (Simroth, 1889); D. oertzeni (Sim- lijke Historié, Leiden; S, sphermatheca; SD,

roth, 1889); D. thersites (Simroth, 1886) (cf. spermathecal duct; SOD, spermoviduct; VD, vas

Tandonia Museum Amsterdam. de Mylones, 1982) ; sowerbyi (Férussac, deferens; ZMA, Zoologisch 78

1-2. Limax conemenosi Figs. aff. Boettger. 1, anterior genitalia; 2, apical part of penis.

LIMACIDAE fig. 3; Hudec & Vasatko, 1973, fig. 6; Rahle,

1977, 2; Wiktor, 1983, 63) this fig. fig. ,

Limax (Limax) aff. conemenosi distance is at least twice the length of the

1882 Simroth O. Boettger, penial caecum. (1889, fig. 8) also exam-

(figs. 1-2) ined specimens from the Isle of Andros, and his

in drawings are accordance with our observa-

tion. It must be stressed that, as far as we Material.-

are aware, nothing has been published on the 1 juvenile specimen (length 45 mm), Stavrope-

20 of da (= km SW of the town Andros), under a anatomy of type specimens or even topotypes of

rock; UTM LB1184; 21-IV-1984. 1 adult specimen L. conemenosi. Boettger's original description (length 142 mm!), just outside Andros, along

the road to Stavropeda, under a rock; UTM only refers to the external characters. Except LB1890; 27-IV-1984. for Simroth all with (1889), papers dealing the

anatomy of this species refer to Jugoslavian

- Discussion. and Bulgarian specimens. It is therefore possi-

We hesitate to identify these specimens with ble, if this feature proves to be constant,

L. conemenosi, because of the short distance that we are dealing with two distinct although between the insertion of the penial retractor closely related (sub)species. muscle and the of the which The of adult is entry vas deferens, length our specimen (142 nun)

the of the far than the maximum is about equal to length penial larger length ever record-

all of the ed for L. conemenosi Wik- caecum. In nearly published drawings (80 mm, according to penis of L. conemenosi (Urbanski & Wiktor, 1968, tor, 1983). 79

3-6. Deroceras anterior viewed from the Figs. johannae n.sp., holotype. 3, genitalia; 4, penis,

other with side; 5, penis opened, showing sarcobelum; 6, rectum rectal caecum. 80

AGRIOLIMACIDAE exposed. It is situated underneath the intesti-

nal caecum, not at the rear of the body. The

is short and little sinuous. Deroceras johannae spec. nov. hermaphrodite duct

(figs. 3-10) The spermoviduct and prostate are greyish-black

for most of their lengths, becoming paler ante-

Material.- riorly. The albumen gland and anterior genita-

Moll. lia is Holotype and two paratypes in ZMA: are cream. The spermatheca pear-shaped,

385001 and 385002 respectively; two paratypes with a short, broad spermathecal duct. The in RMNH (no. ale. 9124).

penis has a lower bulbous sack, which contains

Type locality.- the sarcobelum. The apical part of the penis is

Greece, , Isle of Andros, 2 km W of large, kidney-shaped, consisting of two diverti-

Korthion, along the road to Kochylou (= 17 km cula of about equal size. On top of one of them

SSE of Andros), under stones; UTM LB1883; 23-IV- a bunch of six thin, crenulated appendages are

1984. present. The vas deferens enters the penis on

the same diverticulum, somewhat lower. The sar-

Diagnostic features.- cobelum is large, flat, with a semicircular

A with well outline. the it is bound with large, dark-grey Deroceras a In holotype up, a

Penis with furrow between the folds developed rectal caecum. apically deep, narrow two

of which with tuft in it is somewhat two large diverticula, one a (fig. 5); a paratype (fig. 8) of crenulated the lower with in long, thin, appendages; irregular, only a superficial furrow;

part of the penis contains a large, semicircu- another paratype it is folded like in the holo-

lar which is folded its but the folds do sarcobelum, along long type, not lay so closely axis. together. Between both diverticula an unbranch-

ed penial retractor muscle is inserted. The

External appearance (fig. 9).- atrium is attached to the body wall by small

All adults and between muscles. specimens are measure

26 and 33 mm. The hole-type is 26 mm long and

about 4.5 mm broad. Its mantle length is 13 mm. Derivation of name.-

The mantle and dorsum are unicolourous dark- D. johannae is named in honour of Mrs. J.E.

her grey; the sides are gradually becoming lighter Butot-Okkersen, to acknowledge collecting

towards the sole. Around the pneumostome a efforts together with her husband. She also

lighter, slightly swollen border is present. collected this slug.

Superficial furrows run across the dorsum and

sides. The sole is cream coloured. An indis- Discussion.-

tinct keel is present on the posterior end of Several unicolourous dark species of Deroce-

the dorsum. There is little variation in exter- ras have been described or reported from Greece. nal appearance among the available specimens. D. oertzeni (Simroth, 1889) from Kowari Mountain

(Oros Kouvara), Andros, seems to be smaller

Shell (fig. 10).- (according to Simroth, 1889, fig. 3, about

The shell of a of 31 mm measured 23 mm) and has a unicolourous grey sole. Fur- paratype ,

6.4 x 4.0 mm. ther, it differs in having no or only a very

small rectal caecum, longer, more slender

diverticula with lateral Intestine (fig. 6).- penial as well as api-

all examined distinct rectal cal and in branched In specimens a appendages, having a penial

is which is twice muscle caecum present, about as long retractor (Simroth, 1889, fig. 11). D.

as broad. thersites (Simroth, 1886) from Piraeus near

Athens has a differently shaped penis and

Genital system (fig. 4-5, 7-8).- penial appendage and is usually spotted on the

The ovotestis consists of relatively small, dorsum and mantle (cf. Wiktor, 1983, figs. 96-

dark-brown little or not at all 101) U. cf. sensu very "acini, . andrios Reischiitz, 1983b, 81

7-10. Deroceras anterior Figs. johannae n.sp., paratypes. 7, genitalia; 8, penis opened, showing

shell. sarcobelum; 9, external appearance; 10,

near Fig. 11. Deroceras keaensis Altena, Greece, Isle of Kea, Kea, paratype (RMNH no. ale. 9002),

penis opened, showing sarcobelum. 82

five lobate and a from the Isle of Thasos has a differently shap- appendages very conspicuous

short of the deferens. Sarco- ed penis and sarcobelum and only a very papilla at the entry vas

4-5). belum with blunt rectal caecum (Reischiitz, 1983b, figs. broad, flat, a apex.

ikaria 1983 The same holds for D. Reischiitz,

(Reischiitz, 1983a, figs. 1-5). D. berytensis External appearance (fig. 12).-

(Bourguignat, 1852) from Beirut, Lebanon, has The holotype is 18 mm long; its mantle

with small according to Wiktor & Mylonas (1981: 192) "an length is 7.5 mm. light brown

a oval penis without appendix". Simroth's (1889: dark spots on mantle and dorsum. There is

on end 15) interpretation of this species refers to a conspicuous keel present the posterior species completely different from D. johannae. of the dorsum. Very superficial, hardly discern-

sides. Sole Prof. A. Wiktor suggested (in litt.) that able furrows run across dorsum and

either our specimens may belong to D. keaensis cream.

samium Altena, 1973 or D. Rahle, 1983. Of both

- species type material (in RMNH) could be stud- Shell.

ied. D. keaensis from the Isle of Kea has Not examined.

about the same size and external appearance, as well rectal and Intestine 16).- as a similar caecum pigmenta- (fig.

caecum tion of prostate and spermoviduct. The penis, A clear rectal is lacking.

however, has a different shape with a bunch of

short Genital 12-15).- about ten smooth appendages apically on a system (figs.

of The ovotestis is stalk. According to Altena's (1973) figure very small, nearly black,

is different situated under the rectum, partly the sarcobelum, this organ clearly partly expos-

ed and too. His figure is somewhat misleading, how- (fig. 16) . Spermoviduct prostate grey-

of revealed ish. The consists of two lower ever. The examination a paratype penis parts: a

which contains the sarcobelum and a that D. keaensis can also posses a large, fold- pa*t, cylin-

is covered five ed structure, which is, however, folded several drical apical part, which by

lobate On the of times along its short axis (fig. 11) . D. samium long, appendages. apical part

also the is from the Isle of Samos possesses a large penis a very conspicuous papilla present

in the of the deferens. An unbranched sarcobelum, which is not semicircular like at entry vas

muscle is inserted the D. johannae. Moreover, it only has a very short penial retractor at

and bunches of of the penis. The is rectal caecum always two appen- upper part spermatheca

or less the duct is dages on the upper part of the penis (Rahle, more round; spermathecal

and slender. 1983, figs. 1-8). very long

Derivation of Deroceras korthionensis spec. nov. name.-

korthionensis village (figs. 12-16) D. is named after the

of Korthion, in the vicinity of which the holo-

Material.- type was found.

Holotype in ZMA (Moll. 385003).

Discussion. -

have tried associate the with Type locality.- We to specimen

D. Greece, Cyclades, Isle of Andros, 2 km W of one of the many published names. korthionen-

Korthion, along the road to Kochyou (= 17 km sis is externally not unlike D. pseudopanormita-

from Nomos Joanninon, SSE of Andros), under a stone; UTM LB1883; num Wiktor, 1984, Tymfi,

in 23-IV-1984. but this species differs having a flat,

tongue-like sarcobelum (cf. Wiktor, 1984, figs.

Diagnostic features.- 28-33). D. cycladicum Wiktor & Mylonas, 1981,

similar external but has A small brownish Deroceras with black spots also has a appearance,

the mantle and dorsum. Penis with "flat, fan-like, stimulator, on on apically a asymmetrical 83

12-16. Deroceras korthionensis Figs. n.sp., holotype. 12, external appearance; 13, anterior genita-

lia; 14, penis, viewed from the other side; 15, penis opened, showing sarcobelum; 16,

of visceral posterior part mass. 84

side one elongate triangularly" (Wiktor & Mylo- Remarks.-

nas, 1981: 191, fig. 29). All specimens posses very juvenile genita-

Prof. who studied of lia. external resemble D. A. Wiktor, some our In appearance they

(in litt.) that our nov. The of the drawings, suggested speci- johannae spec. . apical part

men might belong to either D. berytensis (Bour- penis bears two diverticula. They probably be-

guignat, 1852) or D. boettgeri (Simroth, 1889), long to either D. oertzeni or D. johannae.

both species of which the original description

must be considered insufficient. We have, how-

ever, the following arguments that D. korthio- MILACIDAE

nensis does not belong to either of these:

(1) According to Bourguignat (1852: 10), D. be- Tandonia sowerbyi (Férussac, 1823)

rytensis is black, while D. korthionensis

is brownish with dark D. 1823. spots. Moreover, Limax sowerbii Férussac, Emend, in sower-

byi, 336 (1955), Decl. In- "a Opinion Opinions berytensis has long caecum at rectum, tern. Comm. Zool. Nomencl., 10 (3): 107.

oval penis without appendix (and a) wide Amalia carinata (Risso, 1826). Simroth, 1889:

20, "Andros, vom Berge Kowari" (Oros Kouva- symmetrical, nearly semicircular stimula- ra).

tor" according to Wiktor & Mylonas (1981:

who studied from 193) , specimens Lebanon, Material.-

which probably belong to this species. 1 specimen (length 32 mm), 2 km SE of Kolym-

(2) D. boettgeri is similar in colour (Simroth, bos, along the road to Stavropeda (= 21 km WSW

of Andros) UTM LB0986; 23-IV-1984. 1 specimen 1889, 4) but has a slender, sar- fig. , long (27 mm), 1 km S of Atheni (= 17 km E of Ga-

cobelum ("einen schmalen Reiz- 26-IV-1984. langen vrion); UTM LB0795; 1 specimen (21 mm), 2 km ESE of Remmata (= 18 km NW of korper") (Simroth, 1889: 15). Andros); UTM LB 0993; 25-IV-1984.

(3) In view of the tendency towards endemism on

the Greek Islands (Wiktor s Mylonas, 1981; Milax or Tandonia spec.

Mylonas, 1982), it is not likely, that

either D. berytensis from Lebanon or D. Material.-

boettgeri from Crete are conspecific with 4 specimens (16, 18, 18 and 19 mm), Batsi,

korthionensis. walls km SE of D. on stony (= 12 Gavrion); UTM

LB0592; 24-IV-1984. For these reasons we prefer to introduce a new species although we have only one specimen

Remarks.- instead of such at our disposal, leaving a

All specimens are juveniles with only very peculiar form unnamed. More material would be

small genitalia. They differ considerably from very desirable to establish the variation of

of specimens Tandonia sowerbyi of the same its characters.

size, the only member of the family Milacidae Both D. johannae and D. korthionensis have

far from so reported the Isle of Andros. They been not assigned to any of the subgenera of

lack the very conspicuous keel and the mottled Deroceras, which are currently recognised, be-

mantle and dorsum, present in T. They these sowerbyi. cause appear not te be based on synapomor-

are not unlike juveniles of Milax gagates (Dra- is discussed elswhere phic characters, as (De

parnaud, 1801) i.e. with white f greyish a keel Winter, in press).

on the dorsum.

Deroceras spec.

REFERENCES

Material.-

2 and specimens (20 16 mm), Batsi, on stony walls 12 km SE of UTM 24- C.O. VAN REGTEREN (= Gavrion); LB0592; ALTENA, , 1973. Notes on land-

IV-1984. 2 (17 specimens and 15 mm), spring slugs, 21. On a new species of Deroceras

Pitrofos 14 km of near (= SW Andros) on wet from the Island of Kéa, Greece.- Basteria,

leaves; UTM LB1387; 21-IV-1984. 37: 89-92. 85

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1852. novissima 1 BOURGUIGNAT, J.R., Testacea .

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Jugoslawien (Gastropoda: Pulmonata).- Arch. Gastropoda, )Ann. Zool. Moll., 107 (4/6): 225-247. Warszawa, 3_7 (3): 71-206. 1984. from 1983. Eine neue Deroceras-Art Six Deroceras , (Gastropo- , species

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& M. 1981. New Deroceras REISCHUTZ, P.L., 1983a. Deroceras (Plathysti- , MYLONAS, spe-

ikaria cies from Islands mulus) n.sp. von Ikaria, Griechenland Cyclades (Greece) (Gastro- Malak. (Gastropoda, Pulmonata, Agriolimacidae).- poda, Pulmonata, Agriolimacidae).- Malak. Abh. Dresden, 9 (3): 23-24. Abh. Dresden, 1_ (17): 183-193.

A Deroceras 1983b. Ein zur Mol luskenfauna WINTER, A.J. de, in press. new , Beitrag from north-western der Insel Thasos (Griechenland).- Ann. natur- species Spain (Gastropo-

hist. Mus. Wien, 8j>/B: 133-146. da, Pulmonata, Agriolimacidae).- Zool. Meded. Leiden.

A.J. de Winter,

Dorpsstraat 139,

6871 AG Renkum

The Netherlands.

L.J.M. Butot,

Institute for Taxonomic Zoology,

University of Amsterdam,

P.O. Box 20125,

1000 HC Amsterdam, Received : 5.XI.1984

The Netherlands. Distributed : 28.VI.1985