Bonnierella, CHEVREUX, 1900

Souza-Filho, Jesser F. & Serejo, Cristiana S., 2014, On the phylogeny of Ischyroceridae (Amphipoda, Senticaudata, Corophiida), with the description of a new genus and eight new species from deep-sea Brazilian waters, Zoological Journal of the Linnean Society 170 (1), pp. 34-85 : 47-49

GENUS BONNIERELLA CHEVREUX, 1900

Bonnierella Chevreux, 1900: 97 . – Stebbing, 1906: 737. – J.L. Barnard, 1962: 70. – J.L. Barnard, KEY TO THE GENERA OF ISCHYROCERIDAE USED IN THIS ANALYSIS

1. Pereopods 5–7 with accessory spines; uropods 1 and 2 peduncle with distoventral corona of spines; uropod 3 uniramous; telson rectangular, wider than long, with rows or patches of recurved spines ............................... 2

– Pereopods 5–7 without accessory spines; uropods 1 and 2 peduncle with acute interamal process; uropod 3 biramous; telson triangular, longer than wide, without rows or patches of recurved spines ........................................... 9

2. Telson with two patches of recurved spines on each side.........................................................................3

– Telson with rows of recurved spines on distal margin.............................................................................5

3. Antenna 1 shorter and often more slender than antenna 2............................................. Siphonoecetes group

– Antenna 1 subequal to antenna 2........................................................................................................4

4. Gnathopod 2 carpus shorter than propodus in female ............................................................... Ericthonius

– Gnathopod 2 carpus longer than propodus in female ......................................................... Pseudericthonius

5. Antenna 1 article 1 with anterior margin medially and distally expanded.................................................. 6

– Antenna 1 article 1 with anterior margin not medially and distally expanded.............................................7

6. Gnathopod 2 subchelate in both male and female..................................................................... Bathypoma

– Gnathopod 2 carpochelate in male and subchelate in female........................................................ Notopoma

7. Pereopods 5–7, distal part directed posteriorly........................................................................ Paracerapus

– Pereopods 5–7, at least the propodus and dactylus directed anteriorly.......................................................8

8. Antenna 1, posterior margin of peduncular article 1 lacking swelling, peduncular article 3 longer than article 2, accessory flagellum vestigial.................................................................................................... Runanga

– Antenna 1, posterior margin of peduncular article 1 with swelling, peduncular article 3 shorter than article 2, accessory flagellum absent ....................................................................................................... Cerapus

9. Gnathopod 1 carpus longer than propodus; coxa 5 with posterior lobe; tip of outer ramus of uropod 3 with a plate bearing spines........................................................................................................... Pseudischyrocerus

– Gnathopod 1 carpus shorter than or subequal to propodus; coxa 5 without posterior lobe; outer ramus of uropod 3 without accessory spines near apex, but with recurved spines................................................................10

10. Coxa 4 not excavated posteriorly, basis of pereopods 3–7 rectangular ........................................... Bonnierella

– Coxa 4 excavated posteriorly; basis of pereopods 3–7 not rectangular.......................................................11

11. Urosomite 1 with two dorsal teeth; telson without subapical spines............................................ Bathyphotis

– Urosomite 1 without dorsal teeth; telson with a pair of subapical spines........................... Myersius gen. nov.

1964: 42. – J.L. Barnard, 1969. – J.L. Barnard, 1973. – Ledoyer, 1982: 184. – J.L. Barnard & Karaman, 1991: 176.

Type species

Podoceropsis abyssi Chevreux, 1887 .

Diagnosis

Antenna 1 subequal to antenna 2; peduncular article 1 long and rectangular; article 1 longer than article 2. Eyes absent. Mandibular palp well developed and 3-articulate. Gnathopod 1 carpus shorter than propodus. Gnathopod 2 subchelate in both sexes; carpus shorter than propodus. Coxae 1–7 wider than long. Coxa 4 posterior margin not excavated. Pereopods 3–7 basis rectangular. Pereopod 4 merus equal to merus of pereopod 3. Pereopod 5 similar to pereopods 6 and 7; carpus long, subrectangular, and without denticles or spines on posteroventral margin. Pleosomite without lateral ridges. Peduncle of pleopods slender and not expanded. Pleopod 2 inner ramus present, as long as outer ramus. Urosomite 1 without dorsal spines. Uropod 1 peduncle with acute interamal process; outer margin of outer ramus smooth. Uropod 2 biramous; outer margin of rami smooth, with robust setae. Uropod 3, outer ramus with recurved spines (only visible with high magnification). Telson without hooks or denticles.

Included species

Bonnierella abyssi ( Chevreux, 1887) ; Bonnierella abyssorum ( Bonnier, 1896) ; Bonnierella angolae J.L. Barnard, 1962 ; Bonnierella californica J.L. Barnard, 1966 ; Bonnierella campensis sp. nov.; Bonnierella compar Myers & Cunha, 2004 ; Bonnierella dimorpha Ledoyer, 1982 ; Bonnierella lapisi (J.L. Barnard, 1962) ; Bonnierella laurensi sp. nov.; Bonnierella linearis J.L. Barnard, 1964 ; Bonnierella palenquia J.L. Barnard, 1967 .

Excluded species

Bonnierella longiramus Ledoyer, 1982 , incertae sedis.

General remarks

The genus Bonnierella was erected by Chevreux (1900) in the family Photidae based on the species Podoceropsis abyssi Chevreux, 1887 , differing from other genera by: the shape of male gnathopod 2; rectangular basis of pereopods 3–7; and telson triangular. Later, J.L. Barnard (1964) transferred Bonnierella to the family Ischyroceridae based on the presence of spines on the outer ramus of uropod 3 and the rami of uropod 3 shorter than the peduncle. The spines on the outer ramus of uropod 3 in Bonnierella are visible only at high magnification. Subsequently, Myers & Lowry (2003) erected the subfamily Bonnierellinae in their phylogenetic study of the suborder Corophiidea . These authors showed that this subfamily, composed of Bonnierella and Bogenfelsia Barnard, 1964 , is the basal branch of the family Ischyroceridae .

The genus Bonnierella has been, until the present study, composed of ten species, and this number is now raised to 11 ( Table 5). The reason is that B. longiramus Ledoyer, 1982 shows some characters outside the diagnosis of Bonnierella , and should be removed from the genus. This species has the anteroventral margin of the head moderately excavated, gnathopod 1 with the carpus longer than the propodus, coxae 1–4 longer than wide, uropod 3 with the rami longer than the peduncle, the outer ramus with a rudimentary second article, and the telson trapezoid with two subdistal crests ( Ledoyer, 1982: fig. 64). Considering that the last two characters do not fit the diagnosis of the family Ischyroceridae , the position of this species is still unclear.

Geographic distribution

Cosmopolite, deep sea.