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Isopoda, Cirolanidae

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Isopoda, Cirolanidae Bijdragen tot de Dierkunde, 54 (1): 51-65 — 1984 Amsterdam Expeditions to the West Indian Islands, Report 39. Arubolana parvioculata n. sp. (Isopoda, Cirolanidae) from the interstitial of an intermittent river in Jamaica, with notes on A. imula Botosaneanu & Stock and A. Aruboides (Bowman & Iliffe) by Jos Notenboom Institute of Taxonomie Zoology ( Zoölogisch Museum), University of Amsterdam, P.O.Box 20125, 1000 HC Amsterdam, The Netherlands 6 de Cirolanides Summary (Discovery Bay). Jusqu’à présent, genres stygobiontes, avec 9 espèces, sont connus de 7 îles des Arubolana parvioculata, a new stygobiont species of cirolanid Indes Occidentales. La nouvelle espèce est de petite taille is described from habitat isopod crustaceans, an interstitial et allongée, caractères typiques des habitants des intersti- near the mouth of an intermittent river, the Rio Secco, ces. C’est une espèce euryhaline. Discovery Jamaica. This is the first subterranean Bay, Une donnée Arubo- description supplémentaire est pour cirolanid from 6 of Jamaica. Alltogether, genera stygo- lana imula Botosaneanu & Stock, 1979 (espèce-type du biont from 7 islands cirolanids, with 9 species, are known genre); celle-ci est réalisée sur des exemplaires supplémen- in the West Indies. The new species has a small and taires capturés dans la terra typica. Bermudalana aruboides which is ofinhabitants ofinterstitia. elongate body, typical Bowman de & Iliffe, 1983, de grottes Bermuda, est consi- It is also euryhaline. dérée comme appartenant à Arubolana. On souligne les dif- An additional description is given of Arubolana imula férences morphologiques et écologiques entre les trois Botosaneanu of the & Stock, 1979, type-species genus, espèces d’Arubolana; certaines de ces différences sont habi- based from the Ber- on new specimens type-locality. considérées tuellement comme permettant une distinction mudalana aruboides Bowman & from Iliffe, 1983, caves on niveau Il donc les trois au générique. est possible que espè- the oceanic island is referred the Bermuda, to genus ces devront être considérées comme appartenant à des Arubolana. The morphological and differences ecological de sous-genres distincts, mais, compte tenu l’imparfaite between the three Arubolana are out. Some species pointed connaissance le décision que nous avons sur groupe, cette of these differences are considered characteristic of usually n’a été pas prise. distinction on therefore the three generic level; species On les Arubolana dérivées d’un peut supposer que sont possibly have to be recognized as members of different ancêtre marin du type Metacirolana, mais il est difficile but of limited this subgenera, on account our knowledge d’établir scénario des événements. On un considère A. decision has not been made. imula élément de tandis A. comme regression, que aruboides It is presumed that the Arubolana species originated from et A. parvioculata peuvent être aussi bien des éléments de a Metacirolana type of marine ancestor. A general evolu- regression et/ou de dispersion. tionary scenario for Arubolana is difficult to construct. A. imula but is considered a regression element, A. aruboides and A. parvioculata can be either regression and/or dispersal elements. INTRODUCTION Résumé In the series of publications dealing with the stygobiont fauna collected during the Amster- Une espèce nouvelle d’Isopodes Cirolanides, Arubolana par- dam Expeditions to the West Indian Islands, vioculata, est décrite. Ce premier Cirolanide hypogé de la this is the third article cirolanid Jamaïque a été découvert dans un habitat interstitiel, près concerning de l’embouchure rivière d’une intermittente, le Rio Secco isopods. The previous publications in this series Stock were by Botosaneanu & (1979) and * Notenboom In the (1981). present paper a new Report 38 is published in the same issue of this journal. species from Jamaica is described from the 52 J. NOTENBOOM - ARUBOLANA table in of the water river sediments near the coast. The peduncle first antenna in Furthermore, Arubolana imula Botosaneanu & cirolanids is composed of three articles of which Stock, 1979, the original description of which article one and two can be partly or totally based male has been fused. In the distal of the third article dif- was on one juvenile only, part a studied based ferentiated be again, now on more specimens zone can recognized, separated from the type-locality, collected during the 1980 from the third article (figs. 5-6, 33-34). This Bermudalana aruboides Bowman expedition. & II- zone has often been illustrated by isopodologists the iffe, 1983, is transferred to genusArubolana. (Bowman, 1966; Monod, 1930; Racovitza, The affinities, position within the family, and 1912; Rioja, 1956) but has rarely been of the Arubolana there three the zoogeography species are described. Theoretically are is of the discussed. possibilities: this zone part peduncle, or Until five the years ago, only hypogean a flagellum article, or an articulation zone. In from cirolanids known the West Indies were the both Arubolana imula and A. parvioculata, setae Cuban trichostoma this which species Haptolana Bowman, are implanted on apical zone, sug- and cubensis it is articulation between 1966, Troglocirolana** (Hay, 1903). gests that not just an the few different and observation During past years, however, flagellum peduncle. Although biologists have contributed to this fauna, from is very difficult either with light microscopy or several islands: Botosaneanu & Stock, 1979 with scanning electron microscopy, it is my im- (Arubolana imula from Aruba), Carpenter, 1981 pression that the limit between peduncular arti- from San Salvador cle 3 and this is either (Bahalana geracei Island), zone only partially or not 1981 Bahalana from all and that the itself is rather Notenboom, ( cardiopus at chitinized, zone and Haitilana** radicicola and H. membranous. This that it Mayaguana, suggests belongs to acanthura from Haiti), and finally Bowman & the peduncle. Botosaneanu& Stock (1982) men- 1982 ** from Grand tioned similar situation in the Franz, (Anopsilana crenata a genus Cyathura The result is that the 6 Cayman). at moment (Anthuridea), and they reached the same con- with 9 known from 7 islands clusion: this differen- genera species are they considered zone as a tiated of last with (see map 1). part the peduncular article, Most of these cirolanids inhabitants of sensorial function. Bruce are possibly a prevailing the of this cave waters; however, two species (in press) considers zone as being a Haitilana known from karstic and terminal in are a spring a "fourth small fused article", and and discussed it that it well, respectively, a new species my opinion seems probable originated in this discovered in another of from fourth article. paper was type a peduncular Another in the literature groundwater habitat, the interstitial of a tem- problem on the porary river. cirolanid isopods is the confusion in ter- used authors for the minology by some man- dibular 35 and In parts (figs. 9-10, 37). my Some remarks on the morphology of stygobiont these have be named follows: opinion parts to as cirolanids the strongly sclerotized, dark coloured, triden- I median is the While studying stygobiont cirolanids, en- ticulated margin masticatory in the dif- blade is the triar- countered some obscurities use by or pars incisiva; laterally ticulated with setation the second ferent authors of morphological terms. In this palp, on and section the used for of third between the and the terminology some parts article; palp the cirolanid body will be discussed. masticatory blade, small unarmed lobes are found, which represent the molar process or is pars molaris; dorsomedially a denticulated, mobile the * * triangular, (articulate) process, Bruce (in press) regards Troglocirolana and Haitilana as lacinia between and the with mobilis; lacinia mobilis synonymous Anopsilana Paulian & Delamare Debout- blade is armed with teville, 1956, considered a paraphyletic genus. masticatory a lobe, strongly BIJDRAGEN TOT DE DIERKUNDE, 54 (1) - 1984 53 spines, the incisor; sometimes the masticatory TAXONOMIC PART blade has an accessory spine laterally. Arubolana Botosaneanu & Stock, 1979 Carpenter (1981), on the contrary, named the incisor, lacinia mobilis, and the lacinia mobilis, Diagnosis. — Depigmented Cirolanidae (ex- Bruce named the molar; (1981) masticatory for brown blind cept masticatory blades), or blade, incisor, and the incisor, molar process; with small able to roll into a eyes. Body not ball; Bowman & Iliffe (1983) named the masticatory pleon with 5 free segments, lateral margin of blade, incisor, the lacinia mobilis, molar, and segment 5 free or overlapped by segment 4. the incisor, lacinia. Clypeus much wider than high, anterior margin With the there to pereiopods, is a respect of frontal lamina broad. Antenna 1 not longer in whether problem deciding a pereiopod is than the peduncle of antenna 2; peduncle prehensile or ambulatory. Bruce (pers. comm.) 3-articulated; flagellum 5-articulated, with the criterion: when the dac- adopted following aesthetascs. Peduncle of antenna 2 is than the of the tylus longer greatest length with few 5-articulated, flagellum relatively ar- propodus, the is considered pereiopod prehen- ticles. Mandible and first maxilla normal; sec- when the is it is sile; dactylus shorter, con- ond maxilla showing loss of articles. Max- sidered ambulatory. In opinion this is too my illipedal palp 4-articulated (articles 2 and 3 a view. The best criteria are observa- simple endite with or
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