Brachylamprops scabridus, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 36-43

publication ID	https://doi.org/ 10.11646/zootaxa.4428.1.1
publication LSID	lsid:zoobank.org:pub:2419A7F0-5AED-47EC-86BB-06AADB2A4BD9
DOI	https://doi.org/10.5281/zenodo.3799420
persistent identifier	https://treatment.plazi.org/id/03FD87BA-FFCF-2E01-64FF-F9EDD7D2CAE3
treatment provided by	Plazi
scientific name	Brachylamprops scabridus
status	sp. nov.

Treatment

Brachylamprops scabridus View in CoL n. sp.

( Figs 8–11 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURE 11 )

Type material. Holotype: ovigerous female, AM P101483 , 33 °43–44’S, 151°46’E 174 m, coast of New South Wales, Australia, 20 December 1985 . Paratypes: ovigerous female (dissected), AM P101484 , collected with holotype ; ovigerous female (dissected), AM P101485 , collected with holotype ; adult male (dissected), AM P101486 , collected with holotype .

Other material. 9 individuals, AM P101487, 33°43–44’S, 151°46’E, 174 m, 20 December 1985; 1 individual, AM P101488 , 32°53’S, 152°35’E, 165 m, 15 August 1985; 1 adult GoogleMaps male, AM P101489 , 33°45’S, 151°43’E, 176 m, 5 December 1977 GoogleMaps . 2 ovigerous females, 3 preparatory females, 1 broken juvenile female, NMV J54385 View Materials , 34°59’31”S, 151°5’56”E, 204 m, 14 July 1986 GoogleMaps .

Description. Holotype female, AM P 101483. Carapace covered in small spines, without marginal carina, not flattened, with paired posteriodorsal prominences, several large tumidities on carapace; pseudorostral lobes 0.4 carapace length, blunt; eyelobe 0.5 carapace length, with 2 lenses; carapace 1.2 length of pereonites together. Pereonites with 2 paired dorsal ridges. Pleonites 1–3 with 2 paired dorsal ridges, pleonites 4–5 with single central dorsal ridge, pleonite 6 with 2 paired dorsal ridges ( Fig. 8A View FIGURE 8 ).

Paratype female, AM P 101484, 5.2 mm .

Antennule peduncle article 1 unarmed; article 2 0.7 article 1 length, with 7 simple setae; article 3 0.5 article 2 length, with 5 simple setae; main flagellum of 3 articles, with 4 simple setae and 2 aesthetascs terminally; accessory flagellum of 2 articles, 0.9 main flagellum length, with 3 simple setae ( Fig. 8B View FIGURE 8 ).

Antenna not examined.

Mandible navicular, with 10 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 8C View FIGURE 8 ).

Maxillule with 2 endites; outer endite with 10 setae terminally; inner endite with 1 dentate and 3 simple setae; palp with 2 setae, 1 0.3 length of longer seta ( Fig. 8D View FIGURE 8 ).

Maxilla with 3 endites; broad endite with 1 pappose and many simple setae distally, medial row of 23 simple setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extend past distal margin of broad endite ( Fig. 8E View FIGURE 8 ).

Maxilliped 1 basis produced medially as broad lobe, with 2 simple and 2 stout microserrate setae terminally, 2 hook setae and 6 simple setae medially; ischium absent; merus 0.2 basis length, with plumose seta laterally; carpus 2.3 merus length, with 12 simple and 8 comb setae medially, 1 plumose seta laterally; propodus 0.6 carpus length, with 3 pappose and 5 simple setae; dactylus 0.9 propodus length, with 4 simple setae ( Fig. 8F View FIGURE 8 ).

Maxilliped 2 basis longer than all other articles together, distal corner expanded, with 3 pappose setae medially, 5 plumose setae on distal corner; ischium 0.8 basis length, with pappose seta; merus 2.0 ischium length, with plumose seta laterally; carpus 1.9 merus length, with 7 pappose setae medially, plumose seta laterally; propodus 0.8 carpus length, with 3 simple setae medially, simple seta laterally; dactylus 0.3 propodus length, with 1 microserrate and 4 simple setae terminally ( Fig. 8G View FIGURE 8 ).

Maxilliped 3 basis longer than all other articles together, with 14 pappose setae medially, 3 plumose setae distally; ischium 0.03 basis length, unarmed; merus 3.0 ischium length, with pappose seta medially, plumose seta laterally; carpus 3.8 merus length, with 2 simple and 9 pappose setae medially, with plumose seta laterally; propodus 0.5 carpus length, with 4 plumose setae medially, 4 plumose setae laterally; dactylus 0.6 propodus length, with 3 simple setae terminally; exopod longer than basis, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 8H View FIGURE 8 ).

Pereopod 1 basis as long as next 4 articles together, with 22 pappose setae medially; ischium 0.07 basis length, with 2 pappose setae; merus 2.5 ischium length, with 3 pappose setae, medial margin with 2 teeth; carpus 2.5 merus length, with 7 pappose setae, medial margin serrate; propodus equal to carpus length, with 1 annulate and 3 simple setae; dactylus broken; exopod shorter than basis, basla article with 6 pappose setae, flagellum with plumoannulate setae ( Fig. 9A View FIGURE 9 ).

Pereopod 2 basis as long as all other articles together, with 4 pappose setae; ischium 0.04 basis length, with pappose seta; merus 4.0 ischium length, with 5 pappose setae; carpus 2.5 merus length, with 9 simple setae; propodus 0.2 carpus length, with 2 simple setae; dactylus 4.0 propodus length, with 5 simple setae; exopod 0.4 basis length, basal article with 2 pappose setae, flagellum with plumo-annulate setae ( Fig. 9B View FIGURE 9 ).

Pereopod 3 basis 2.3 all other articles together, with 14 pappose setae; ischium 0.04 basis length, with 2 simple setae; merus 4.0 ischium length, with 2 simple setae; carpus 0.9 merus length, with 3 simple and 2 annulate setae; propodus 0.7 carpus length, with annulate seta; dactylus 0.4 propodus length, with 3 simple setae terminally; exopod absent ( Fig. 9C View FIGURE 9 ).

Pereopod 4 basis 1.7 all other articles together, with 6 pappose and 2 simple setae; ischium 0.07 basis length, unarmed; merus 2.7 ischium length, unarmed; carpus 0.9 merus length, with 2 simple and 2 annulate setae; propodus 0.9 carpus length, with 2 annulate setae; dactylus 0.3 propodus length, with 5 simple setae terminally; exopod absent ( Fig. 9D View FIGURE 9 ).

Pereopod 5 basis 1.2 all other articles together, with 1 pappose and 11 simple setae; ischium 0.1 basis length, unarmed; merus 2.3 ischium length, with 2 simple setae; carpus 0.9 merus length, with 2 simple and 1 annulate setae; propodus 0.8 carpus length, with 1 simple and 2 annulate setae; dactylus 2.5 propodus length, with simple seta terminally ( Fig. 9E View FIGURE 9 ).

Telson 4.5 length of pleonite 6, margins serrate, with 2 simple lateral setae, 3 terminal setae subequal to lateral setae ( Fig. 9F View FIGURE 9 ).

Uropod peduncles 4.2 pleonite 6 length, margins serrate, equal to telson length. Uropod endopod of 3 articles, 0.7 peduncle length; article 1 3.1 articles 2 and 3 together, with 16–17 simple setae medially; article 2 0.2 article 1 length, with 3 simple setae medially; article 3 0.8 article 2 length, with 1 lateral and 1 terminal simple setae with single subterminal setule, terminal seta 3.25 article 3 length. Uropod exopod subequal to endopod; article 1 0.3 article 2 length, unarmed; article 2 with 7–9 simple setae medially, 2 simple setae laterally, terminal seta with single subterminal setule, 0.5 article 2 length ( Fig. 9F View FIGURE 9 ).

Paratype male, AM P 101486, 5.5 mm. Carapace same pattern of ridges and tumidities present, but less pronounced than in female; pseudorostral lobes 0.4 carapace length; eyelobe 0.09 carapace length, with 2 lenses; carapace 1.6 pereonites. Pereonites with pair of dorsal ridges. Pleonites 1–3 with 2 pairs dorsal ridges, pleonites 4– 6 with 1 central and 1 pair dorsal ridges ( Fig. 10A, B View FIGURE 10 ).

Antennule peduncle article 1 1.3 articles 2 and 3 together, unarmed; article 2 0.6 article 1 length, with 3 simple and 1 pedunculate and 1 plumo-pedunculate setae; article 3 0.4 article 2 length, with 1 simple and group of many aesthetascs distally; main flagellum of 3 articles, with 2 simple setae and 2 aesthetascs; accessory flagellum of 3 articles, with5 simple setae ( Fig. 10C View FIGURE 10 ).

Antenna extending to posterior border of pleonite 4; article 1 with pappose seta; article 2 with 2 pappose setae; article 3 unarmed; articles 4 and 5 with ranks of setae, not completely encircling; flagellum with short articles, 1 seta per article ( Fig. 10D, E View FIGURE 10 ).

Maxilliped 3 basis 1.4 all other articles together, with 3 simple and 7 plumose setae medially, 3 plumose setae distally; ischium 0.04 basis length, unarmed; merus 1.5 ischium length, with plumose seta medially, plumose seta laterally; carpus 6.0 merus length, with 6 plumose and 6 simple setae medially, 2 plumose setae laterally; propodus 0.6 carpus length, with 5 simple setae medially, 5 plumose setae laterally; dactylus 0.4 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with plumose seta, flagellum with plumo-annulate setae ( Fig. 10F View FIGURE 10 ).

Pereopod 1 basis longer than next 4 articles together, with 9 plumose setae medially, 7 plumose setae laterally, lateral margin serrate; ischium 0.05 basis length, with plumose seta; merus 2.5 ischium length, with 2 plumose setae medially and 2 plumose setae laterally; carpus 2.8 merus length, with 3 plumose setae medially, 4 plumose setae laterally, medial margin serrate; propodus equal to carpus length, with 5 simple and 3 plumose setae; dactylus 0.6 propodus length, with 12 simple setae; exopod broken, maxilliped 3 exopod to show approximate size ( Fig. 11A View FIGURE 11 ).

Pereopod 2 broken, not illustrated.

Pereopod 3 basis 2.4 all other articles together, medial and lateral margins serrate, with simple seta; ischium 0.05 basis length, with 2 simple setae; merus 2.3 ischium length, with 2 simple setae; carpus 0.9 merus length, with 2 annulate setae; propodus 0.6 carpus length, with annulate seta; dactylus 0.6 propodus length, with 2 simple setae terminally; exopod shorter than basis, basal article with 6 plumose setae, flagellum with plumo-annulate setae ( Fig. 11B View FIGURE 11 ).

Pereopod 4 basis 2.0 all other articles together, with 5 plumose setae; ischium 0.06 basis length, with 2 simple setae; merus 3.0 ischium length, with 2 simple setae; carpus 0.9 merus length, with 1 simple and 2 annulate setae; propodus 0.6 carpus length, with annulate seta; dactylus 0.4 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 3 plumose setae, flagellum with plumo-annulate setae ( Fig. 11C View FIGURE 11 ).

Pereopod 5 basis as long as next 4 articles together, with 1 simple and 5 plumose setae; ischium 0.2 basis length, with 2 simple setae; merus 1.6 ischium length, with 2 simple setae; carpus 1.11 merus length, with 1 simple and 2 annulate setae; propodus 0.6 carpus length, with annulate seta; dactylus 0.7 propodus length, with 2 simple setae terminally ( Fig. 11D View FIGURE 11 ).

Pleopod 1 biramous, basal article with 9 plumose setae, medial corner serrate; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 11E View FIGURE 11 ).

Pleopod 2 biramous, basal article with 4 plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 11F View FIGURE 11 ).

Pleopod 3 biramous, basal article with 3 plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 11G View FIGURE 11 ).

Telson 2.6 length of pleonite 6, with 3 simple lateral setae, lateral margins with few serrations, 3 terminal microserrate setae ( Fig. 11H View FIGURE 11 ).

Uropod peduncles 2.8 pleonite 6 length, 1.1 telson length, with 21 microserrate setae medially. Uropod endopod of 3 articles, 0.7 peduncle length; article 1 2.1 articles 2 and 3 together, with 16 microserrate setae with subterminal setule medially; article 2 0.3 article 1 length, with 4 microserrate setae with subterminal setule medially; article 3 0.6 article 2 length, with microserrate seta with subterminal setule medially, simple seta laterally, terminal seta with subterminal setule 4.75 article 3 length. Uropod exopod subequal to length of endopod; article 1 0.2 article 2 length, unarmed; article 2 with 9 microserrate and 2 simple setae medially, 7 simple and 2 microserrate setae laterally, terminal seta with subterminal setule 0.8 article 2 length ( Fig. 11H View FIGURE 11 ).

Etymology. The species is named scabridus , from the Latin, in reference to the rough and rugged carapace.

Depth. 165–176 m.

Distribution. 151°E, 33°S, coast of New South Wales, Australia.

Remarks. Brachylamprops scabridus n. sp. is unique amongst the Lampropidae in the short, rugged carapace.