Haplostoma laticaudatum, Kim & Boxshall, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.4978.1.1 |
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publication LSID |
lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93 |
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DOI |
https://doi.org/10.5281/zenodo.10530923 |
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persistent identifier |
https://treatment.plazi.org/id/3729879B-FF73-FF60-FA93-FE15D6B11D8B |
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treatment provided by |
Plazi |
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scientific name |
Haplostoma laticaudatum |
| status |
sp. nov. |
Haplostoma laticaudatum sp. nov.
( Figs 97 View FIG , 98 View FIG )
Type material. Holotype ♀ (MNHN-IU-2018-1997), 1 ♀ paratype (MNHN-IU-2018-1998), and 1 ♀ paratype (dis- sected MNHN-IU-2014-17384) from mseudçdẚstçma cyrnusense Pérès , 1952; Tunisia, no other collection data.
Etymology. The name is derived from the Latin lat (=broad) and cauda (=the tail), alluding to the broad caudal rami of the new species.
Description of female. Body ( Fig. 97A, B View FIG ) eruciform, slightly curved dorsally; body length 1.60 mm, maximum width 424 μm at region of leg 2. Cephalosome ( Fig. 97C, D View FIG ) not defined from first pedigerous somite ( Fig. 97A View FIG ), narrowing anteriorly. Metasomites defined only by constrictions; last metasomite consisting of fused fourth and fifth pedigerous somites. Genitoabdomen ( Fig. 97E View FIG ) consisting of genital somite and 2-segmented abdomen. Genital somite wider than long (118×200 μm), consisting of broader anterior and narrower posterior parts, with dorsal strip connecting paired genital apertures. First and second abdominal somites 27×109 and 55×90 μm, respec- tively. Caudal ramus ( Fig. 97F View FIG ) triangular, slightly wider than long (36×38 μm); armed with 1 seta on outer margin and 1 unequally bifurcate spine on apex. Egg sac longer than body, containing 2-4 rows of eggs; each egg about 140 μm in diameter.
Rostrum not developed, represented by produced frontal apex of cephalosome ( Fig. 97C View FIG ). Antennule ( Fig. 97G View FIG ) tapering, unsegmented, but with 3 or 4 partial suture lines along posterior side, armed with 16 small setae, fourth proximal seta with swollen base. Antenna ( Fig. 97H View FIG ) 2-segmented; proximal segment unarmed; distal segment as long as proximal, armed with 4 large, conical spines.
Labrum ( Fig. 97I View FIG ) with 6 large, blunt lobes along posterior margin, 2 lateral lobes on each side fused proximally (appearing as 2 bifurcate lobes and 2 simple lobes). Mandible ( Fig. 97I View FIG ) longer than wide, tipped with 1 or 2 small setae. Maxillule and maxilla absent. Maxilliped ( Fig. 98A View FIG ) tapering distally, 4-segmented; first segment unarmed; second segment incompletely articulated from first, slightly wider than long, armed with 2 small setae; third segment unarmed; fourth segment with small denticle at inner distal corner; terminal claw as long as fourth segment, with 1 small denticle proximally on inner margin.
Legs 1-4 consisting of protopod, exopod and endopod; protopods unarmed; exopods incompletely demarcated from protopod; endopods represented by broad protuberance. Exopod of leg 1 ( Fig. 98B View FIG ) armed with 1 seta and 4 simple spines. Exopod of leg 2 ( Fig. 98C View FIG ) armed with 1 seta and 3 simple spines. Legs 3 and 4 armed as leg 2.
Leg 5 ( Fig. 98D View FIG ) as conical tubercle, wider than long, bearing 1 proximal and 2 distal setae. Leg 6 ( Fig. 98E View FIG ) represented by 1 spinule and 3 spiniform processes on genital operculum; 9 small internal denticles present near leg 6.
Male. Unknown.
Remarks. Five species of eaplçstçma are now known to have 6 large lobes along the posterior margin of the labrum, as in e. latẚcaudatum sp. nov. They are e. banyulensẚs, e. kẚmẚ, e. eruca, e. pẚngue sp. nov., and e. vanuatuense sp. nov. Of these species, only in e. eruca are the 2 lateral lobes on each side of the labrum fused at base ( Ooishi & O’Reilly, 2004) as in e. latẚcaudatum sp. nov. eaplçstçma latẚcaudatum sp. nov. differs from e. eruca in having 1 spine plus 1 seta on the caudal ramus (vs. 2 spines and 1 seta in e. eruca), 3 spines plus 1 seta on the exopod of legs 3 and 4 (vs. 2 spines plus 1 seta in e. eruca), and a small leg 5 (vs. large leg 5, about 1.2 times longer than wide in e. eruca according to Ooishi & O’Reilly, 2004).
In e. latẚcaudatum sp. nov. the exopod of leg 1 is armed with 4 spines plus 1 seta and the exopods of legs 2-4 are each armed with 3 spines plus 1 seta. This combination of armature is shared with e. brevẚcauda (Canu, 1886), e. kẚmẚ, e. setẚferum Ooishi & Illg, 1977, and e. vanuatuense sp. nov., but, e. latẚcaudatum sp. nov. can be distinguished from these congeners by the different form of the labrum as mentioned above and by the differing armature of caudal ramus, which bears 2 armature elements (1 spine plus 1 seta) in contrast to 3 or more armature elements in these other four congeneric species.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.