Bulbamphiascus Lang, 1944

Gómez, Samuel, Corgosinho, Paulo Henrique Costa & Rivera-Sánchez, Karen I., 2021, Proposal of new genera and species of the subfamily Diosaccinae (Copepoda: Harpacticoida: Miraciidae), European Journal of Taxonomy 759 (1), pp. 1-62: 39-41

publication ID

https://doi.org/10.5852/ejt.2021.759.1433

publication LSID

lsid:zoobank.org:pub:4E28C54D-855A-478F-BB84-9576FFE8F24B

DOI

http://doi.org/10.5281/zenodo.5104690

persistent identifier

http://treatment.plazi.org/id/0B3187C8-FF84-8968-FDFA-324AFC91AA8D

treatment provided by

Felipe

scientific name

Bulbamphiascus Lang, 1944
status

 

Bulbamphiascus Lang, 1944  

Type species

Canthocamptus imus Brady, 1872   , by original designation.

Other species

Bulbamphiascus denticulatus ( Thompson, 1893)   , B. incus Gee, 2005   , B. plumosus Mu & Gee, 2000   and B. scilloniensis Gee, 2005   .

Species incertae sedis

Bulbamphiascus chappuisi Rouch, 1962   .

Amended diagnosis

Miraciidae   : Diosaccinae   . Body fusiform. Rostrum not fused to cephalothorax, triangular, elongate, with rounded apical margin, almost as long as first, second and third antennulary segments combined, with one subdistal sensilla on each side at third quarter of its length. Pro- and urosomites without extensions; with a flexible unsclerotized cuticle between prosome and urosome. First urosomite (P5-bearing somite) narrower than preceding somites in dorsal view. Female genital double-somite (genital – second urosomite – and third urosomites fused) completely fused ventrally, with a dorsolateral cuticular rib marking former division between somites. Anal somite trapezoidal, without anal operculum. Caudal rami 1.6 times as wide as long in dorsal view, with seven setae. Female antennule eight-segmented, with aesthetasc and seta fused basally on fourth segment and with apical acrothek on last segment. Male antennule haplocer, 10-segmented, with aesthetasc and seta fused basally on fifth segment, and with apical acrothek on last segment.Antennulary setae typically smooth. Antenna with allobasis and abexopodal seta; exopod threesegmented, armature formula 1-1-1,3,0. Mandibular palp biramous; endopod one-segmented, exopod two-segmented. Maxillule biramous; rami one-segmented. Maxilla with three endites, proximal and middle endites with two, distal endite with three elements; ENP one-segmented. Maxilliped subchelate; (syn)coxa with four, basis with two setae, ENP one-segmented with claw and three accompanying setae. P1–P4 with three-segmented rami. Male P1 basis sexually dimorphic, with inner unipinnate spine and inner modified accessory spine. P1 EXP shorter than ENP, reaching tip of ENP2; EXP2 with inner seta; ENP1 with inner seta; ENP3 longer than the ENP2, with one inner seta, a distal long and geniculate seta, and an outer spine. P2–P4 EXP and ENP of approximately the same length; P2–P4 EXP1 with inner seta; inner distal seta of EXP3 visibly shorter than other elements of same segment; P2 ENP2 with two setae, proximal shorter. Male P2 ENP sexually dimorphic, two-segmented; first segment with one inner seta; second segment with two inner setae, one inner subdistal sigmoid element, one subdistal and one distal seta arising from cylindrical extension fused basally to segment, and one strong distal outer element strongly tapering distally. P5 EXP with six setae in female and male; one or two medial outer elements transformed into short spines. P5 endopodal lobe with five setae in female, with two setae in male; armature of male P5 endopodal lobe strongly bipinnate.

Armature formula View Figure of P1–P5 as follows:

Sexual dimorphism expressed in male antennule, P2 ENP, P5, P6, and in genital and third urosomites being separated.

Apomorphies for Bulbamphiascus  

We did not detect any apomorphy for Bulbamphiascus   . However, Bulbamphiascus   is part of a larger monophyletic group composed of Spinodiosaccus gen. nov., Spinopedia   gen. nov. and Pallarica   gen. nov. ( Fig. 19 View Fig ). The subdistal outer element of the male P2 ENP2 with almost parallel margins, viz slightly tapering distally, is considered here as part of the ground pattern of this monophyletic group and is regarded as a potential synapomorphy for this clade. The modification of this spine into a strong tapering element is regarded here as secondary and is a synapomorphy for Bulbamphiascus   and Spinodiosaccus   gen. nov. The combination of an outer subdistal tapering spine and a sigmoid inner subdistal element on the male P2 ENP2 is unique to Bulbamphiascus   (the outer subdistal spine on the male P2 ENP2 of Spinodiosaccus   gen. nov. also tapers distally, but the inner subdistal element on the same segment of this species is rather straight).

Bulbamphiascus chappuisi   is here relegated to incertae sedis due to the shape of the rostrum and furca, and to the morphology of the male P2 ENP, the illustrations of which (see Rouch 1962: 247, figs 29–33) are too schematic, preventing any further comparison.

Kingdom

Animalia

Phylum

Arthropoda

Class

Maxillopoda

Order

Harpacticoida

Family

Diosaccidae

Loc

Bulbamphiascus Lang, 1944

Gómez, Samuel, Corgosinho, Paulo Henrique Costa & Rivera-Sánchez, Karen I. 2021
2021
Loc

B. incus

Gee 2005
2005
Loc

B. scilloniensis

Gee 2005
2005
Loc

B. plumosus

Mu & Gee 2000
2000
Loc

Bulbamphiascus chappuisi

Rouch 1962
1962