Dinetia, Gómez & Corgosinho & Rivera-Sánchez, 2021

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: 43-45

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gen. nov.

Dinetia   gen. nov.


Syn. Bulbamphiascus Lang, 1944: 19   , pro parte.

Type and only species

Bulbamphiascus minutus Dinet, 1971   (= Dinetia minuta ( Dinet, 1971)   comb. nov), by monotypy.


Miraciidae   : Diosaccinae   . Body fusiform. Width: length ratio of caudal rami 0.8–1.2. Rostrum not fused to cephalothorax, elongate, with rounded tip. Female antennule eight-segmented, with aesthetasc and seta fused basally on fourth segment. Antennulary setae typically smooth. Antenna with allobasis and abexopodal seta; EXP three-segmented, armature formula 1-1-1,3,0. Mandibular palp extremely reduced. Maxillule biramous; rami one-segmented. Maxilla with three endites. Maxilliped subchelate; (syn)coxa with two, basis with two setae; ENP one-segmented, with claw and two accompanying setae. P1–P4 with three-segmented rami. P1 EXP shorter than ENP1, reaching its distal third; P1 ENP1 with strong bipinnate inner seta; ENP3 about twice as long as ENP2, with one small inner seta, a long distal geniculate seta and an outer spine; P1 EXP2 with inner seta, EXP3 with three outer spines, proximal one shortest, and two geniculate distal setae. P2–P4 EXP1 with inner seta; P2–P4 EXP3 with reduced inner armature. P2 ENP1 with inner setae; ENP2 with two setae of approximately same length. Female P5 EXP longer than wide, with six setae – three outer, two distal and one inner element. P5 endopodal lobe with five setae.

Armature formula View Figure of P1–P5 as follows:

Male unknown.


This genus is dedicated to Alain Dinet for his contribution to the taxonomy of harpacticoid copepods from France. Gender feminine.

Apomorphies for Dinetia   gen. nov.

The exclusion of Bulbamphiascus minutus   from that genus and from any other genus presented here, and its reallocation into Dinetia   gen. nov., is supported by, for example, the lack of the short inner distal seta on P2–P4 EXP3. Bulbamphiascus minutus   probably bears a sister-group relationship with Pseudamphiascopsis Lang, 1944   and Rhyncholagena Lang, 1944   , with which it forms a monophyletic group (see Fig. 19 View Fig ). These three genera share the longer P1 ENP1 relative to the P1 EXP. Given that B. minutus   could not be included in Bulbamphiascus   or into any other diosaccin genus, and pending the discovery of the male of this species, we propose a new genus, Dinetia   gen. nov., for B. minutus   . The assessment and significance of character 43 for D. minuta   comb. nov. (see Table 3 View Table 3 ) is still pending until the male is described.

Phylogenetic statistics and resolution

Our partial phylogenetic analysis resulted in 12 most parsimonious topologies with 126 steps, CI of 42, and RI of 77 (see Supplementary File 1). The strict consensus topology (nine branches collapsed) returned the following clades of unclear phylogenetic affinities between each other: a) a small clade composed by Dinetia   gen. nov., Pseudamphiascopsis   and Ryncholagena; b) a clade formed by Antiboreodiosaccus Lang, 1944   , Diosaccopsis Brian, 1925   , Goffinella Wilson, 1932   , Ialysus Brian, 1927   , Pseudodiosaccopsis Lang, 1944   and Pseudodiosaccus   T. Scott, 1906; c) a clade formed by Typhlamphiascus Lang, 1944   , Monardius Huys, 2009   , Tydemanella A. Scott, 1909   , Robertsonia Brady, 1880   , Amphiascus Sars, 1905   , Pararobertsonia Lang, 1944   , Sinamphiascus Mu & Gee, 2000   , Pallarica gen. nov., Spinopedia   gen. nov., Bulbamphiascus   and Spinodiosaccus   gen. nov.; d) a clade composed of Amonardia Lang, 1944   , Diosaccus Boeck, 1872   , Pholenota Vervoort, 1964   , Parialysus Nicholls, 1941   , Amphiascoides Nicholls, 1941b   , Paramphiascella Lang, 1944   , Robertgurneya Apostolov & Marinov, 1988   , Miscegenus Wells, Hicks & Coull, 1982   , Neomiscegenus Karanovic & Ranga Reddy, 2004   , Paramphiascoides Wells, 1967   , Schizopera Sars, 1905   , Actopsyllus Wells, 1967   , Balucopsylla Rao, 1972   , Eoschizopera Wells & Rao, 1976   , Haloschizopera Lang, 1944   , Helmutkunzia Wells & Rao, 1976   , Schizoperoides Por, 1968   , Protopsammotopa Geddes, 1968   and Psammotopa Pennak, 1942   . The phylogenetic position of the genera Dactylopodamphiascopsis Lang, 1944   , Metamphiascopsis Lang, 1944   and Sarsamphiascus Huys, 2009   remains uncertain. It is important to highlight the high level of character convergence within the Diosaccinae   .

Clades a–d above are present in the 12 most parsimonious topologies (see Supplementary File 1), but their relationships are not consistent. The positions of the clade Dinetia   gen. nov. – Rhyncholagena   and the genera Sarsamphiascus   , Metamphiascopsis   and Dactylopodamphiscopsis are unclear, sometimes forming a clade with Typhlamphiascus   Spinodiosaccus   gen. nov. (6 times), sometimes forming a clade with Amonardia   Psammotopa   (6 times). The same happens to the clade Antiboreodiosaccus   Pseudodiosaccus   which appears either as the sister group of the remaining Diosaccinae   or as the sister group of a clade including Dinetia   gen. nov. – Rhyncholagena   , Sarsamphiascus   , Metamphiascopsis, Dactylopodamphiscopsis   and Typhlamphiascus   Spinodiosaccus   gen. nov.













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

Dinetia minuta ( Dinet, 1971 )

Gómez & Corgosinho & Rivera-Sánchez 2021

Bulbamphiascus minutus

Dinet 1971


Lang 1944: 19