Trichopeltarion hystricosum (Garth in Garth & Haig, 1971)

Tavares, Marcos & Cleva, Régis, 2010, Trichopeltariidae (Crustacea, Decapoda, Brachyura), A New Family And Superfamily Of Eubrachyuran Crabs With Description Of One New Genus And Five New Species, Papéis Avulsos de Zoologia (São Paulo) 50 (9), pp. 97-157 : 133-136

Trichopeltarion hystricosum (Garth,

in Garth & Haig 1971)

Trachycarcinus hystricosus . Garth. in. Garth. &. Haig,. 1971:6.12,.pl. 3,.figs. 1-5.

Trachycarcinus hystricosus . –. Bahamonde. &. Báez,. 1975:3;. Andrade. &. Báez,. 1980:263;. Salva. &. Feldmann,.2001:29.

Trichopeltarion hystricosus .–.Guzmán. et al.,.2009:278.

“ Trichopeltarion” hystricosum .–.Ng. et al.,.2008:52.

Material examined:. Central. Chile,. Golden Wind,.H.. Andrade. coll..&.det.:.stn GW-05,. 31°56’S- 71°45’W,. 350-400 m,. 03 Oct 1976,. 1 ♂. 30.2 x 30.5 mm. ( MNHN-B31967 ) ;. stn GW-56,. 32°31’S- 71°54’W,. 300-350 m,. 20 Mar 1979,. 2 ♀♀. 32.0 x 33.3. &. 33.0 x 34.3 mm. ( MNHN-B31968 ) ;. stn GW-59,. 32°31’S- 71°54’W,. 400 m,. 09 Jul 1979,. 6 ♂♂. 25.3 x 26.5 mm.to.34.8 x 35.4 mm,. 8 ♀♀.28.5 x 31.7. to. 33.8 x 36.4 mm. ( MNHN-B31969 ) ;. stn GW-68,. 32°33’S- 71°43’W,. 300 m,. 09 Apr 1979,. 3 ♂♂. 27.0 x 28.2.to.30.8 x 32.5 mm.( MNHN-B31970 ) ;. ibidem,. 2 ♂♂. 17.0 x 18.3,. 31.2 x 32.4 mm,. 1 ♀. 32.0 x 34.5 mm. ( MZUSP. 22701);. stn GW-72,. 32°42’S- 71°48’W,. 350-400 m,. 08 Nov 1979,. 1 ♂. 31.0 x 32.7 mm,. 2 ♀♀.28.2 x 30.5.&.33.3 x 33.2 mm. ( MNHN-B31971 ) .

Type locality:. Off. Peru,. 11°50’S- 77°58’W,. between. 935.and.907.meters.depth .

Description:.The. following. are. additions. to. the. previously.published.data..Carapace.pentagonal,.surface. densely.covered.with.long.setae;.front.cut.into.three. teeth.of.about. same.length..Orbits.large,.deeply.excavated;. ocular. peduncles. thick,. cornea. large,. dark. brown,. freely. movable,. fully. retractable. into. orbital. cavity;.ommatidiae.well.recognizable..Orbitals,.hepatic,.and.epibranchial.teeth.strong,.acute,.lacking.barbs.. Mxp3.merus.not.reaching.antennal.article.1.. Thoracic . sternal.tubercles.from.abdominal.locking.system.adjacent.to.sternal.sutures.5/6.

Right. cheliped. extremely. developed.. Dactylus. and.fixed.finger.noticeably.long,.straight,.curved.terminally.only;.cutting.edges.armed.with.salient,.rather. acute. teeth.. Female. chelipeds. equal,. closely. resembling.small.male.cheliped.

Male.abdomen.of.six.free.segments.and.telson;. abdominal.segment.6.longest,.its.anterolateral.angles. slightly. protruded,. weakly. swollen;. complementary. parts.of.abdominal.locking.system.present.and.functional..G2.very.long,.styliform,.rather.straight,.crossing.well.before.tip.. Female.abdomen.of.six.free.segments.and.telson;.thoracic.sternal.tubercle.distinct.in. young.females.only.(30 x 28 mm),.abdominal.locking. system.not.functional..Vulvae.large,.subcircular,.operculate. in.young. females,.placed. near.sternal.median. line,.far.from.lateral.border.of.sternite.6,.adjacent.to. sternal.suture.5/6.

Remarks:. Salva. &. Feldmann. (2001:29). concluded. that. Trichopeltarion hystricosum .should.no.longer.remain. in. the. genus. Trichopeltarion . and. suggested. its. assignment. to. another. existing. genus. or. to. a. new. genus.yet.to.be.created.for.it..Our.examination.of.a. number.of.males.and.females.of. Trichopeltarion hystricosum .revealed,.however,.that.it.shows.a.combination. of. characters. only. found. in. Trichopeltarion ,. including:. carapace. pentagonal;. deeply. excavated. orbital. cavity;. antennal. setae. dispersed. all. around. antennal. segments.(articles.2+3,.4-5).and.flagellae,.setae.of.opposing.sides.of.flagellum.forming.incipient.antennal. conduit. at.most,.antennal.flagellae. short;.possession. of. well. distinct. first. epibranchial. tooth;. mandibular. palp.2-articulated,.with.articles.1-2.completely.fused. to.one.another.and.no.line.of.suture.in.between;.one. well. developed. Pl2. pleurobranchia;. one. well. developed. mxp2. podobranchia;. anteriormost. of. the. two. Pl3.pleurobranchiae.shortest;.male.and.female.abdomen.of.six.free.segments.and.telson.

Distribution:.Known.from. Peru.and. Chile..Although. Retamal. (1993). recorded. Trichopeltarion hystricosum . from. shallow. waters. (5 m),. this. species. seems.more. common. between. 200. and. 1124. meters. in. depth. (Guzmán. et al.,.2009).