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Decapoda: Hippolytidae

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Decapoda: Hippolytidae JOURNALOF CRUSTACEANBIOLOGY, 9(3): 445-452, 1989 KORORMISTICIUS, NEW GENUS, NEW SPECIES (DECAPODA:HIPPOLYTIDAE), A CAVE SHRIMP FROM PALAU Janice Clark ABSTRACT A new genus and species, Koror misticius,a shrimp belongingto a group of 6 monotypic generawithin the Hippolytidaeis describedfrom a marinecave in Palau.It differsfrom Barbouria and Janicea in having arthrobranchson the 4 anterior pairs of pereiopods and epipods on maxilliped 1, from Ligur in differentplacement of the "antennal spine" and in having the propodusof the 3 posteriorpereiopods subdivided, and from Parhippolyteand Somersiellain havinga slenderrostrum and the appendixmasculina distinctly longer than the appendixinterna on the second male pleopod. Onlytwo speciesof carideanshrimps have of all pereiopods.Mandible bearing 3-joint- been recordedfrom the inland saline ponds ed palp. Pereiopods 1 and 2 chelate; pe- and wells and the anchialine and marine reiopod 2 merus and carpussubdivided; is- caves of Palau: Halocaridinidestrigonoph- chium subdivided in distal one-third, thalma (Fujino and Shokita, 1975) (Hart, although less distinctly than carpus and 1980; Holthuis, 1982) and Caridina typus merus; pereiopods 3, 4, and 5 with propo- Kubo, 1941. The species here described is dus subdivided and merus bearing strong allied to BarbouriaRathbun, 1912, Janicea lateral spines. Endopod of first pleopod of Manning and Hart, 1984, Ligur Sarato, male without appendix interna, that of sec- 1885, ParhippolyteBorradaile, 1899, and ond with slenderappendix masculina longer Somersiella Hart and Manning, 1981. Un- than appendixintera and bearing2 clusters like the previously described shrimps be- of setae. with- longingto these five monotypicgenera TypeSpecies. -Koror misticius,new species. in the Hippolytidae,the new species has no -Named afterthe unique characterthat may be relied upon Etymology. type locality, Koror Palau. to distinguish it from them. However, cer- Island, tain characteristicsthat occur in members Gender.-Masculine. combined of the other genera are uniquely Relationships.--The features shared by the be in this new shrimp. Because it cannot 6 genera are: presence of "antennal" and as assigned to any one of these genera they branchiostegalspines, pigmented eyes, shape are currentlydefined, the new genus Koror and armament of pleura 6, two arthro- is erected to receive it. branchs on maxilliped 3, pleurobranchs above the Hippolytidae pereiopods, epipods on maxil- liped 3 and anterior 4 pereiopods, lack of new Koror, genus incisor process on mandible, 3-jointed Diagnosis. -Carapace smooth, bearing mandibular palp with last segment being "antennal"and branchiostegalspines; ros- long, chelate pereiopods 1 and 2, multiar- trum dentate, short. Eyes well developed ticulatepropodus, carpus, and merus on pe- and pigmented. First 4 abdominal pleura reiopod 2, merus of pereiopods 3-5 undi- broadly rounded and unarmed; fifth and vided and armed with spines, 2 pairs of sixth producedin sharptooth. Telson bear- dorsalspines on telson, and lack of appendix ing 2 pairs of dorsal spines, 3 pairs of mov- intema on first pleopod of male. able spines on posterior margin. Exopods The differencesamong the generaare not- presentonly on maxillipeds. Epipods borne ed in the key. The charactersin the key are on all maxillipeds and first 4 pereiopods. derived from data in: Chace, 1972; Crosnier Pleurobranchs present above all pereio- and Forest, 1973; Hart and Manning, 1981; pods, arthrobranchson third maxillipedand Gordon, 1936; Hobbs et al., 1977; Hobbs first4 pereiopods,and setobranchson coxae III, 1978; Holthuis, 1963; Lemaitre, 1984; 445 446 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 9, NO. 3, 1989 Fig. 1. Koror misticius, new genus, new species. Lateral view of male paratype. Manning and Hart, 1984; Monod, 1968; Telson 3.7 times as long as broad, taper- Rathbun, 1912; Senna, 1903; Wear and ing in width posteriorly; dorsal spines of Holthuis, 1977. telson small, anterior pair situated in pos- terior half, posterior pair lying midway be- Koror new misticius, species tween anterior pair and posterior margin. 1-4 Figs. Posterior margin tapering to sharp median Material. -Male holotype (USNM 235027), and 4 male point and armed with 3 pairs of movable paratypes (USNM 235028) collected from South Point posterior spines (mesial pair one-third length 7?18'32"N Cave, Koror Island, Ngermeuangel, Palau, of middle ones, lateral pair one-half length 134?30'05"E, on 18 April 1985 by Dennis Williams and JeffBozanic. One male (USNM 235029) collected of mesial ones). in limestone cavern on Ngargol Island, Palau, at depth Angle on outer margin of outer ramus of of 20 feet (6.1 m) in nearly complete darkness, 9 Jan- uropod acute, bearing single curved artic- uary 1972, by W. A. Starck and G. R. Allen. ulated spine mesial to angle. Description of Holotype.-Rostrum later- Eyes prominent; cornea pigmented, ally compressed, slender, about 5 times slightly broader than stalk. longer than high, extending almost to distal Antennular peduncle with acute styloce- end of basal segment of antennular pedun- rite not reaching distal end of basal segment. cle, bearing 2 or 3 teeth on dorsal margin Second segment equal in length to third. and 1 or 2 on ventral margin; 1 tooth dis- Antennal scale 4.5 times as long as wide; tinctly postorbital. Antennal angle pro- outer margin straight throughout most of duced anteriorly beyond tip of antennal length, distal tooth overreaching narrowly spine; antennal spine placed behind anterior rounded distal margin of blade, scale over- margin of carapace; branchiostegal spine reaching antennular peduncle by about half placed behind margin, its tip surpassing its length. margin; both antennal and branchiostegal Mandible without incisor process, bear- spines continuing posteriorly in short hor- ing slender 3-segmented palp, distal seg- izontal carina; pterygostomian angle round- ment nearly as long as combined length of ed, not produced. proximal 2 segments. First maxilla with dis- CLARK: NEW HIPPOLYTID SHRIMP FROM PALAU 447 C F 3 4 Fig.3, n g n , 4 6 I - _ Fig. 2. Koror misticius, new genus, new species, holotypic male. A, cephalic region in lateral aspect; B, same, in dorsal aspect; C, lateral view of branchial region showing pleurobranchs, arthrobranchs, mastigobranchs, and epipods; D, telson and uropods; E, detail of terminal part of telson; F, detail of distal part of lateral ramus of uropod; G, antennule in dorsal aspect; H, antenna in ventral aspect; I, pleura 3-6. tal lacinia spatulate, supporting several rows tal one-third, bearing terminal and subter- of short spines on mesial face; proximal la- minal setae. Second maxilla with scaphog- cinia digitiform, bearing many terminal and nathite broadly rounded proximally, not as subterminal setae; palp slightly rolled in dis- broad distally; palp with single subterminal 448 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 9, NO. 3, 1989 Fig. 3. Koror misticius, new genus, new species, holotypic male. A, third pereiopod; B, same, dactyl; C, fourth pereiopod; D, same, dactyl left member; E, fifth pereiopod; F, same, dactyl; G, second pereiopod; H, same, propodus and dactyl; I, first pereiopod; J, same, propodus and dactyl. CLARK: NEW HIPPOLYTID SHRIMP FROM PALAU 449 A 4 ^^/^^ ~s G G A Fig.4. Korormisticius, new genus,new species,holotypic male. A, mandible;B, firstmaxilla; C, secondmaxilla; D, first maxilliped; E, second maxilliped; F, third maxilliped; G, same, terminal spines; H, first pleopod; I, same, distal part of endopod; J, second pleopod; K, same, distal part of appendix intema; L, same, distal part of appendix masculina. spine and several mesial setae; distal, mid- dopod. Third maxilliped overreaching dle, and proximal endites unremarkable. antennal scale, exopod reaching slightly be- First maxilliped with exopod bearing ca- yond midlength of ischium; with 1 epipod ridean lobe on lateral face; epipod bilobed; and 2 arthrobranchs, one small and ob- palp with 2 articles, bearing single subter- scured by larger, more ventrally situated one; minal spine and several setae on mesial face; terminal segment bearing transverse rows proximal endites subtruncate, distal one of weak spines and 1 terminal and 5 sub- broadly rounded. Second maxilliped bear- terminal heavy corneous denticles. ing single epipod, podobranch, and well de- Branchiae and endites as illustrated and veloped exopod reaching much beyond en- as follows (P = present): 450 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 9, NO. 3, 1989 Maxillipeds Pereiopods 1 2 3 1 2 3 4 5 Pleurobranchs 1 1 1 1 1 Arthrobranchs _ -- 2 1 1 1 1 Podobranchs - 1 - Setobranchs P P P P Epipods 1 1 1 1 1 1 - Exopods 1 1 1 Pereiopods as illustrated. Pereiopods 1 onymy of Ligur, assigned Barbouria anti- and 2 chelate, fingers of both shorter than gensis to the new genus Janicea, and as- palms. Pereiopod 2 longer than 1; propo- signeda fifth species to the monotypic genus dus, carpus,and merus subdivided,ischium Somersiella. Koror misticius belongs to a with several rudimentary subdivisions in sixth monotypic genus. Although it has no distal one-third. Pereiopods 3-5 with 3 charactersthat are unique, it does not have spines on posterior surfaceof dactyl, prop- charactersthat allow it to be placed into any odus subdivided, carpus and merus undi- of the existing genera. vided, merus armed with conspicuous Janicea, Barbouria, Ligur, and Somer- spines. siella have unique charactersthat separate Endopod of first pleopod of male half them. Janicea and Barbouriaare the only length of exopod; with cluster of coupling generain this group that lack arthrobranchs hooks at distal end; without appendix in- on the four anteriorpairs of pereiopodsand tera. Endopod of second pleopod of male epipods on the first maxilliped. with thin appendix masculina longer than Ligur is the only genus with a long ros- appendix intera, armed with distal and trum, distinctly overreachingthe antennu- mesial clustersof spines;longest spine about lar peduncle. It is also the only genus with one-half length of appendix masculina. the "antennal spine" conventionally situ- -Rostrum with 1 or 2 ventral ated ventral to the indistinct orbital angle. Variability. In spines.One male with 2 dorsalrostral spines.
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