Eutermes (Diversitermes) Holmgren 1912 : 60,

Oliveira, Danilo Elias & Constantino, Reginaldo, 2016, A taxonomic revision of the neotropical termite genus Diversitermes (Isoptera: Termitidae: Nasutitermitinae), Zootaxa 4158 (2), pp. 221-245: 223-227

publication ID

http://doi.org/10.11646/zootaxa.4158.2.5

publication LSID

lsid:zoobank.org:pub:3FCFD824-EB38-4CC4-93A0-16045C271436

persistent identifier

http://treatment.plazi.org/id/038C87C0-9F19-3675-CF83-FAB7695E21CF

treatment provided by

Plazi

scientific name

Eutermes (Diversitermes) Holmgren 1912 : 60
status

 

Eutermes (Diversitermes) Holmgren 1912: 60 

Nasutitermes (Diversitermes)  : Snyder 1926: 35 [part] Diversitermes: Snyder 1949  [part]

Diversitermes: Mathews 1977: 179  [part]

Diversitermes: Krishna et al. 2013: 1568  [catalog, part] Type-species: Eutermes diversimiles Silvestri 1901  , designated by Snyder (1949: 306).

Imago ( Figs. 1–3View FIGURE 1View FIGURE 2View FIGURE 3). Head capsule elliptic in dorsal view, covered with numerous long hairs. Left mandible: cutting edge between M1 and M3 sinuous; M4 partially visible in the gap between M3 and MPr; tip hidden behind MPr; A and M1 about the same size in both mandibles. Right mandible: posterior margin of A, M1, and M2 about the same length; molar plate narrow (width about 2/5 its length), concave, irregularly shaped, with 6–7 transverse ridges; proximal ridge large and tooth-like, separated from the rest by a gap and orientated at an angle of about 45° relative to the other ridges; basal notch strongly developed, nearly a right angle. Fontanelle spot large and conspicuous, Yshaped, yellowish or light brown. Eyes medium-sized; ocelli well separated from eyes. Antenna with 15 articles. Head, pronotum, tergites and sternites covered with dense hairs and sparse bristles. Wings with short hairs on surface, more numerous on costal border and on apical region. Wings densely covered with asteroid micrasters on entire surface, and papilae on anterior and posterior margins ( Figs. 3View FIGURE 3 D –3F; also described by Roonwal et al. 1981). Each tibia with two apical spurs.

Soldier ( Figs. 4–6View FIGURE 4View FIGURE 5View FIGURE 6). Trimorphic. Nasus subcylindrical. Vestigial mandibles with distinct points. Antenna with 12–14 articles. Tibial spurs 2:2:2. Major soldier. Head capsule proportionally wide, elliptic or subrectangular, without constriction behind antennae. Top of head convex in profile. Pronotum approximately half the width of head. Femur with sparse hairs and a few bristles on inner margin; tibiae with numerous hairs, denser on distal region. Head capsule with two bristles on vertex and four bristles at the base of nasus, and numerous microscopic hairs ( Fig. 7View FIGURE 7 A, B, C, D). Nasus covered with dense short hairs and 4 longer ones at tip. Thorax and abdomen densely covered with microscopic hairs. Pronotum with 2–4 bristles on anterior margin; meso- and metanotum without bristles. Intermediate soldier. Head capsule in dorsal view with nearly parallel or slightly converging sides, and a moderate constriction near the middle. Pronotum approximately 2/3 the width of head. Top of head in profile slightly elevated behind antennae; nasus oriented anteriorly or slightly upturned. Pilosity similar to major soldier. Minor soldier. Head with a moderate to conspicuous constriction behind antennae; sides converging anteriorly. Pronotum approximately 2/3 the width of head. Latera head profile similar to intermediate soldier but with proportionally longer nasus. Head capsule with microscopic hairs similar to those of major soldier; nasus with scattered microscopic hairs and dense short hairs only on apical quarter.

Workers ( Fig. 8–9View FIGURE 8View FIGURE 9). Dimorphic. Head elliptic in dorsal view. Epicranial suture distinct. Legs and antennae short. Antennae with 14–15 articles; 3rd article sometimes incompletely divided. Pronotum with a few bristles on anterior margin and short hairs on posterior margin. Meso- and metanotum without bristles and with short hairs on posterior margin. Tergites with short hairs on surface and a row of bristles on posterior margin. Mandibles similar to those of imago, except for the wider molar plate ( Figs. 7View FIGURE 7 E, F). Two types of major workers workers are present. Type I with narrow pronotum and left mandible with a narrow gap between M3 and MPr; apical tooth shorter than M1; angle between A and M1 narrow; left mandible index 0.35–0.45 ( Fig. 9View FIGURE 9 B, E, H). Type II: slightly larger than type I, with wider pronotum; left mandible with a wide gap between M3 and MPr; apical tooth about the same length as M1; angle between A and M1 wider; left mandible index 0.45–0.5 ( Fig. 9View FIGURE 9 C, F, I). Minor workers rare, conspicuously smaller, with mandibles similar to those of major workers of type I ( Fig. 9View FIGURE 9 A, D, G).

Gut morphology ( Figs. 10–11View FIGURE 10View FIGURE 11). Gizzard and mesenteron of moderate size. Mixed segment very short. Malpighian tubules attached to the gut in two very close pairs near the junction of mesenteron and proctodeum, sometimes with a mesenteric swelling at the point of attachment. First proctodeal segment (P1) short and narrower than mesenteron, strongly curved near the enteric valve. Enteric valve conical and narrow; armature weak and divided into two rings ( Fig. 11View FIGURE 11 B). First ring extending into P1 and comprised of 6 elongate plates, weakly sclerotized, covered with small spines. Second ring located entirely in P2, comprised of 3 small plates alternating with 3 larger ones; small plates more elongate, finger-like, with 3–6 spines; larger plates wider and with 6 or more spines. Enteric valve short, conical, located posteriorly and inserted into a pouch of P3 (enteric valve seating) at the dorsal left or dorsal center side. P3 with an enteric valve seating, not lobed, attached to the rest of P3 by a strong annular sphincter.

Comparisons. Among all genera of Nasutitermitinae, only Diversitermes  , Velocitermes  , and Muelleritermes  have trimorphic soldiers. The major soldier of Velocitermes  has a constricted head, while in Diversitermes  the head capsule of the major soldier is pear-shaped or elliptic, without a constriction. Soldiers of Muelleritermes  have dense short hairs on head capsule while in Diversitermes  they have microscopic hairs only. The head capsule of the intermediate soldier of Muelleritermes  is not constricted. Workers of Muelleritermes  are pale colored, with unpigmented heads. Workers of Diversitermes  can be recognized by the strong annular sphincter between enteric valve seating and the rest of P3, by the Malpighian tubules attached to mesenteron in two pairs separated by a short distance, sometimes on a small mesenteric swelling. Imagoes are similar to those of Velocitermes  and Muelleritermes  .

Remarks. We do not have detailed information on the caste system of Diversitermes  , but it is likely similar to that of Velocitermes  spp. ( Haifig et al. 2012 and our own unpublished data). In V. heteropterus  , large (major) workers are female of at least two instars: 3rd (similar to type I of Diversitermes  ) and 4th (similar to type II of Diversitermes  ). Minor workers are male and become soldiers.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Isoptera

Family

Termitidae

Genus

Eutermes

Loc

Eutermes (Diversitermes) Holmgren 1912 : 60

Oliveira, Danilo Elias & Constantino, Reginaldo 2016
2016
Loc

Diversitermes: Krishna et al. 2013 : 1568

Krishna 2013: 1568
Snyder 1949: 306
2013
Loc

Diversitermes:

Mathews 1977: 179
1977
Loc

Nasutitermes

Snyder 1926: 35
1926
Loc

Eutermes (Diversitermes)

Holmgren 1912: 60
1912